The simplest watchdog. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Security devices and object signaling
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To protect various objects, you can use a watchdog assembled according to the proposed scheme.
Connector X1 (two-socket block) includes a loop of wire with a diameter of 0,1 ... 0,4 mm, laid around the protected object.
In the initial state, the terminals of the base and emitter of transistor V1 are closed by a loop wire, the transistor is closed. When the wire is broken, the transistor opens, in the circuit of the control electrode of the trinistor V2, a current appears to the trinistor also opens. Relay K1 is activated and turns on the signaling device.
In the device, you can use a transistor of the MP39-MP42 series with a static current transfer coefficient of at least 50; the trinistor can be of the KU101 series with any letter index; relay - RES-10 (passport RS4.524.304); battery - 3336L. The current consumed by the device in standby mode does not exceed 60 μA, so the battery life is determined mainly by its self-discharge.
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